U.S. patent number 3,733,662 [Application Number 05/087,976] was granted by the patent office on 1973-05-22 for self-driven turret lathe rotating tool attachment.
Invention is credited to Joseph B. Plevyak.
United States Patent |
3,733,662 |
Plevyak |
May 22, 1973 |
SELF-DRIVEN TURRET LATHE ROTATING TOOL ATTACHMENT
Abstract
A turret lathe rotating tool attachment is provided with gear
ring to effect rotation of a rotary tool in response to a mere
bumping of a laterally extending rack bar slide as by the
manipulation of the lathe cross slide that can be cam operated from
the lathe machine drive. The attachment is self contained and has a
rearwardly extending shank that is adapted to be secured in a
radially extending opening in the turret head and clamped therein
against rotation and axial movement therefrom. A spindle is
provided in each of the forms of this invention which will be
rotated at sufficient speed to effect with a drill or tapping
element a completed operation upon a workpiece. In one of the forms
of the invention provision is made to pre-accelerate the drive
spindle prior to a main drive through a gear train effecting high
speed rotation upon the spindle.
Inventors: |
Plevyak; Joseph B. (Newton,
NJ) |
Family
ID: |
27375799 |
Appl.
No.: |
05/087,976 |
Filed: |
November 9, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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345200 |
Feb 17, 1964 |
3349656 |
Oct 31, 1967 |
|
|
677675 |
Oct 24, 1967 |
3538731 |
Nov 10, 1970 |
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Current U.S.
Class: |
29/57; 74/89.17;
408/126 |
Current CPC
Class: |
B23B
11/00 (20130101); B23B 29/16 (20130101); B23B
43/00 (20130101); Y10T 29/5178 (20150115); Y10T
408/66 (20150115); Y10T 74/18808 (20150115) |
Current International
Class: |
B23B
43/00 (20060101); B23B 29/00 (20060101); B23B
11/00 (20060101); B23B 29/16 (20060101); B23b
047/02 () |
Field of
Search: |
;408/124,126,129 ;29/57
;74/89.17 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Weidenfeld; Gil
Parent Case Text
This invention relates to a self driven turret lathe rotating tool
attachment and this application is a continuation-in-part of my
previous applications, the earlier one being Ser. No. 345,200,
filed Feb. 17, 1964 and now U.S. Pat. No. 3,349,656, dated Oct. 31,
1967 and a later application Ser. No. 677,675, filed Oct. 24, 1967
and being issued as U.S. Pat. No. 3,538,731 and dated Nov. 10,
1970.
Claims
What is claimed is:
1. A self-driven turret lathe rotating tool attachment comprising a
housing body having a first shaft journaled therein, said first
shaft having a pinion gear, a slidable rack bar carried by the
housing and engageable with the pinion gear of the first shaft to
rotate the same upon the slide bar being bumped, said slide bar
extending out of the housing to be bumped by external means, a
second shaft journaled in the housing and extending parallel to the
first shaft and serving as a spindle for the attachment of a rotary
tool element to the second shaft to perform work, and a gear train
interconnecting the first shaft and the second shaft whereby the
second shaft will be rotated at increased speed, said first shaft
having a ratchet gear means thereon, operable independently of the
gear train and said second shaft having a gear pinion engageable by
the ratchet gear means, said ratchet gear means serving to
initially start the rotation of the spindle shaft.
2. A self driven turret lathe rotating tool attachment as defined
in claim 1 and said first shaft having a further ratchet gear means
thereon, and lying within the gear train interconnecting the first
shaft with the spindle shaft.
3. A self driven turret lathe rotating tool attachment as defined
in claim 2 and said housing having a removable rear cover plate, a
mounting stud adapted to be secured in a radial opening of a turret
head extending from the rear of the cover plate and an intermediate
plate disposed between the cover plate and the main housing part
and having certain of the gears of the gear train and the first and
second shafts journaled therein.
4. A self driven turret lathe rotating tool attachment as defined
in claim 2 and said further ratchet gear means having inner and
outer annular parts, said parts having lost motion connected gear
teeth for connecting the one part to the other, and an enlarged
recess extending over an arcuate portion of the connection of the
two parts and a biasing spring lying in the arcuate open section
and serving to absorb load shock in the starting of the gear train.
Description
It is the principal object of the present invention to provide a
turret lathe rotating tool attachment which can be operated to
effect a drilling or tapping operation upon a workpiece by the mere
bumping of a laterally extending slide rack bar from which a train
of gears extend for effecting momentary high speed rotation of work
tool spindle contained therein.
It is another object of the invention to provide a self driven
turret head mounted rotating tool which is of such size that it can
be readily and easily mounted upon the turret head and wherein the
mounting is effected in the same way that an ordinary turret tool
is connected to a turret head and wherein the attachment will be
clamped against rotation and axial displacement.
It is another object of the invention to provide a self driven
turret lathe rotating tool attachment such as to effect a drill or
tapping operation and having a rotating spindle in which means is
provided for effecting preacceleration of the rotating spindle
prior to the spindle being taken over for rotation by a main drive
and gear train and thereby overcome the initial shock to the
attachment when its laterally extending drive slide is bumped to
transfer the power to the attachment.
It is a further object of the invention to provide a self driven
turret lathe rotating tool attachment which will be provided with
two drive spindles in order that cross drilling on opposite sides
of a workpiece can be effected or in which drilling and tapping
operations can be simultaneously effected upon opposite sides of
the workpiece or first upon one side of the workpiece and then upon
the other.
Other objects of this invention are to provide a self driven
rotating tool attachment for turret lathes, having the above
objects in mind, which is of simple construction, compact, durable,
easy to assemble, easy to mount upon the turret head, easy to align
with the workpiece carried on the machine spindle, efficient and
automatic in operation.
For a better understanding of the invention, reference may be had
to the following detailed description taken in connection with the
accompanying drawings, in which:
FIG. 1 is a side and front perspective view of a turret lathe drill
tool attachment constructed according to one form of the invention
and having a preacceleration spindle mechanism.
FIG. 2 is a vertical sectional view taken on line 2--2 of FIG. 1
and looking upon the gear train and clutch at the rear of the
attachment.
FIG. 3 is a fragmentary longitudinal sectional view of the drill
attachment as viewed on line 3--3 of FIG. 1 and with a workpiece
being shown aligned with the drill element.
FIG. 4 is a fragmentary view of the drill spindle removed from the
attachment and detached from the overriding clutch parts.
FIG. 5 is a perspective and collective view of the internal parts
of the attachment, some of the parts separated from one another,
and other parts in assembly with one another.
FIG. 6 is a perspective view looking upon the workface of one of
the overriding clutch parts.
FIG. 7 is a fragmentary plan and sectional view of a segment of the
clutch part removed from between arrows 7--7 of FIG. 6 and broken
away to show a spring biased of a shock absorbing lost motion
connection between two of the clutch parts.
FIG. 8 is a fragmentary elevational view of the cross slide of the
turret lathe that has a portion which engages the revolving or
drill tool attached to the turret head to move its rack slide
operator.
FIG. 9 is a fragmentary sectional view of the clamp parts for
locking the shank of the attachment to the turret head against
radial displacement therefrom, the view being taken generally on
line 9--9 of FIG. 10.
FIG. 10 is a fragmentary top plan view of the turret head looking
generally on line 10--10 of FIG. 9, the view showing the attachment
shank extended through the turret head and upon the head of the
clamping bolt.
FIG. 11 is a front elevational view having a rotary spindle and
shock receiving drill, drill tap, reamer and other tools for
performing back end operations upon a workpiece.
FIG. 12 is a vertical sectional view taken on line 12--12 of FIG.
11.
FIG. 13 is a fragmentary sectional view broken away from the
attachment casing of the attachment shown in FIG. 11 and looking in
plan upon the slide bar rack, the cam slot therein and the spring
biasing mechanism therefor.
FIG. 14 is a front elevational view of another form of the
invention showing a drilling and tapping tool attachment and
employing a large gear train arrangement.
FIG. 15 is a side elevational view of the drill and tapping tool
attachment of FIG. 14 as viewed on line 15--15 thereof.
FIG. 16 is a vertical sectional view taken generally on line 16--16
of FIG. 15 and looking in plan upon the double acting slide bar and
in plan upon the multiple gear train.
FIG. 17 is a longitudinal sectional view of the attachment of FIG.
14 as viewed on line 17--17 of FIG. 16.
FIG. 18 is a detail side elevational view of the tap spindle with a
retracting spring that can replace the drill spindle that is shown
in the attachment in FIGS. 15 and 17.
FIG. 19 is a side elevational view of the drill spindle removed
from the attachment.
FIG. 20 is a vertical sectional view of a turret slotting and
milling tool attachment according to a still further form of the
invention and as viewed on line 20--20 of FIG. 21.
FIG. 21 is a longitudinal sectional view taken on line 21--21 of
FIG. 20.
FIG. 22 is a front elevational view of a cross drilling tool
attachment assembled according to another form of the invention,
with portions broken away and with a workpiece in position in
alignment with the drill and tap tool elements.
FIG. 23 is a vertical sectional view of the cross drill attachment
of FIG. 22 as viewed generally on line 23--23 thereof.
FIG. 24 is a fragmentary detail sectional view of the drill tap
drive and slide mounting as viewed generally on line 24--24 of FIG.
23.
FIG. 25 is a front elevational view of a cross tapping attachment,
according to another form of the invention, with a workpiece in
place within the attachment.
FIG. 26 is a longitudinal sectional view of the screw tapping
attachment of FIG. 25, as viewed on line 26--26 thereof.
FIG. 27 is a longitudinal sectional view of a cross drilling and
tapping attachment according to a still further form of the
invention with the machine spindle and workpiece being shown in
position within the attachment.
FIG. 28 is a front elevational view of a cross slide drilling and
tapping tool attachment according to a still further form of the
invention with portions broken away and parts shown in section.
FIG. 29 is a bottom plan view of the drilling and tapping tool
attachment of FIG. 28 as viewed on line 29--29 thereof.
FIG. 30 is an end elevational view of the drilling and tapping
attachment of FIG. 28 as viewed generally on the 30--30 of FIG.
29.
FIG. 31 is a diagrammatic view of a modified forward and reverse
machine spindle drive that can be applied to the machine cam of
FIG. 8.
Referring now particularly to FIGS. 1 to 10, there is shown a
turret head attachment for effecting a drilling operation in which
provision is made for pre-acceleration of a gear train assembly to
have the drill element enter the work after having been accelerated
and to overcome the initial shock load at the point of contact with
the workpiece by the drill element. According to this form of the
invention, 40 represents generally this pre-accelerated turret head
attachment, which comprises generally main housing part 41 from
which a drill chuck 42 extends from the front thereof and a slide
bar 43 extended from a forwardly extending portion 44 of this
housing part 41 and to the side thereof to be bumped by a portion
of a cross slide on the turret lathe in a manner best shown in FIG.
8 and a rearward cover part 46 secured to the forward housing part
41 by attaching bolts 47 and from which an integral mounting stud
48 extends for attachment into a turret head 49 of the lathe by
bolt and clamp part assembly indicated generally at 51 in FIGS. 9
and 10.
Interposed between the housing part 41 and the rear cover plate 46
is a gear shaft supporting plate 52, FIGS. 3 and 5 and secured
therebetween against axial displacement by the fastening screws 47
that hold the rear plate 46 in engagement with the housing part 41.
Four flat headed screws 53 enter plate 52 to secure the plate on to
the housing part 41 and disposed at four corners the housing part
will, with the aid of dowel pins, not shown, keep the plate 52 in a
more secure and aligned manner for the drive shafts and gears
supported on the plate 52.
In the forward end of the forwardly projected portion 44 of the
housing part 41 is a ball bearing unit 54 in which one end of a
driven shaft 56 is mounted for rotation with the inner race thereof
and the other end of this shaft 56 is reduced in diameter and
journaled in a sleeve bearing 57 carried by the intermediate plate
52. The slide 43 is abutted by a portion 58 as shown in FIG. 8 on a
cross slide 59 of the lathe. This slide bar is slidable into and
out of an opening 59 in the housing projection 44 that is held
against outward displacement therefrom by a stop screw 61 carried
on the inner end of the slide 43 and extending through the opposite
sides of the housing projection 44 as seen in FIG. 8 and has a
spring 62 that will return the slide 43 after it has been bumped by
the portion 58 on cross slide 59. This slide 43 is of square
section and has rack teeth 63 that mesh with a pinion 64 tight
fitted upon the forward end of the driven shaft 56 so that the
shaft 56 is rotated by the inward movement of the slide bar 43.
The shaft 56 has a pre-acceleration gear 66 that has ratchet teeth
67 on the front face thereof adapted to be engaged to be turned by
a clutch part 68 that is splined and inwardly extending projection
69, FIG. 5. slidable in a shaft spline groove 71 and has its
ratchet teeth 72 urged into engagement with ratchet teeth 67 on the
large freely turning gear 66 on the shaft 56 by a compression
spring 73 surrounding the shaft 56 and reacting against a washer 74
lying against the shaft pinion gear portion 64.
The large gear 66 meshes with a pinion gear 76 on a spindle shaft
77 so that the spindle shaft 77 is pre-accelerated by the instant
rotation of gear 66 resulting from inward movement of the slide 43.
This spindle shaft 77 is journaled at one end in the forward wall
of the housing in a bushing or ball bearing unit 78, FIG. 3. This
spindle shaft 77 extends forwardly from the front of the housing
part 41 and has a reduced end 79 to which the drill chuck 42 is
tight fitted or splined, this chuck 42 contains a bushing 81 of
C-shaped section and adapted to be squeezed against a drill element
82 for engagement with a workpiece 83 by a set screw 84 in the
drill chuck 42.
The rearward end of this spindle shaft 77 is reduced in diameter
and shouldered against the forward face of the intermediate plate
52 at 86. A compression spring 87 lies on the opposite side of the
plate 52 and with the reduced end of the spindle shaft 77 extends
into a pocket or recess 88 in the rear plate 46. This compression
spring 87 is backed up by a washer 89 and an adjustable nut 91
threaded upon the reduced end of the spindle shaft.
The spindle shaft 77 has splines 92 at its rear end on which pinion
gears 93 and 94 which are straddled by two large gears 96 and 97,
as best viewed in FIGS. 2 and 5, and which are in turn through
their respective pinions 98 and 99 placed in mesh respectively with
large gears 101 and 102 which again have respective pinion gears
103 and 104 that straddle and engage with a large two part gear
indicated generally at 106 that provides the main drive gear and
which is splined to the slide bar driven shaft 56 as indicated at
107 in FIG. 3. Each of the gears 96, 97, 101 and 102 have stud
shafts 108 that are journaled in a bushing 109 provided in the
intermediate plate 52. Each of these same large gears have
forwardly extending stud shafts 111 that may be journaled in
appropriate bosses, not shown, but can be provided in the housing
part 41. It will thus be seen that through the several large gears
and pinion gears that once the spindle shaft 77 has been
pre-accelerated that a main drive gear assembly 106 may take over
the drive while permitting the gear 66 to slip so that thereafter
increased speed as effected through the gear train provided by the
several gears 96, 97, 101 and 102, can serve to build up the speed
of the drill 82 for effecting a positive and quick drilling action
upon the workpiece 83.
The main drive gear 106 has an outer ring part 116 that has
external gear teeth 117 that are in mesh with the pinion gears 103
and 104 of large gears 101 and 102. Upon the inner periphery of the
outer ring gear 106 are widely spaced inwardly extending teeth 118
meshed and locked with external teeth 119 for some lost motion
movement as indicated by spacing 121 between the teeth and of an
inner ring 122, which is in turn connected on its inner periphery
for rotation upon the shaft 56 in the same manner that the gear 66
is connected to the shaft 56 for free rotation. In order to cushion
the lost motion movement and take up any slack in the drive between
the internal and external rings 122 and 116, a large arcuate space
124, FIG. 7, is provided in the inner periphery of the external
gear ring 116 and circumferentially aligned with the teeth 118
thereof to accommodate a compression spring 125 that will react
between one tooth 118 of the external ring gear 116 and one tooth
119 of the inner ring 122. Thus there has been provided a shock
absorbing gear 106 that can take up any lost motion to allow
immediate drive action of the large gear 66 upon the spindle shaft
77 that will put the gear train in motion as the main gear assembly
106 takes over the main drive.
The drive for the gear 106 is affected through a ratchet plate 126
that locks with ratchet teeth projections 127 on the forward face
of the inner gear ring 122. This ratchet ring 126 in effect is a
part of the gear 106 so that when the ratchet teeth are in locked
engagement the ratchet plate 126 and gear 106 rotate together.
Plate 126 has teeth 128 as best seen in FIG. 5 and these ratchet
teeth are normally held into locked engagement with the ratchet
teeth 127 upon the two ring gear 106 by a compression spring 129 on
the shaft 56 and in engagement with the gear 66. This spring 129 is
stronger than the spring 73 so as to hold the gear 66 in engagement
with its ratchet plate 68. The spring 73 is strong enough to keep
the ratchet plate 68 in engagement with its gear 66 so that the
first drive is effected through this gear 66 with the spindle shaft
77 before the main drive gear 106 has been driven to take over the
drive of the spindle shaft 77 and the drill element 82. At this
time the ratchet teeth on the gear 66 will overrun the ratchet
teeth on its plate 68 and drive will be effected through the
ratchet plate 126 and its gear 106 and through the train of gears
to give to the spindle its final drilling for speed.
In FIGS. 9 and 10 it will be clearly seen that the mounting shank
48 is formed with a flat elongated surface 131 which is adapted to
seat in a notch provided by inclined faces 132 and 133 cut
respectively in a clamp bushing 134 and a clamp nut 135. These
inclined cuts oppose one another and provide a notch, the cut
surface 132 engaging a flat surface 131 while the cut surface 133
is rounded to engage the arcuate surface of the shank. These parts
are locked together in a turret opening 136 that extends downwardly
from the top face of the turret head 49 and are made secure
together by a clamp bolt 137 having a head 138 with clamp washers
139 lying thereunder and brought into flush engagement with the top
surface of the turret head 49. In this manner the attachement is
held rigidly in place against rotation with its shank and against
radial displacement from its turret head 49.
In FIG. 8 a tool post 141 with its lock bolt assembly 142 that
normally supports a cutting element 143 secures upon cross slide 59
a bumper 144 that serves as the cross slide 59 is adjusted to bump
the rack slide 43 of the turret drill attachment 40.
The cross slide 59 by a cam operated segment 146 pivoted upon a pin
147 and having gear teeth 148 meshing with rack gear teeth 149 of
the cross slide 59. This gear segment 146 will be worked by a cam
151 rotated by a longitudinally extending drive shaft 152 of the
lathe. The gear segment 146 has a finger extension 153 with a cam
roller 154 that will follow the cam edge 156 of the cam 151.
Referring now particularly to FIGS. 11, 12 and 13, there is shown
another form of a gear driven revolving or rotary tool attachment
adapted to remove cut-off burrs from a cut end of a workpiece. This
assembly comprises a solid block rectangular shaped body 161 with a
mounting shank 162 adapted to be mounted in the manner above
described in a turret head 49 against rotation and radial
displacement. This tool body 161 has a central recess 163 of a
diameter somewhat equal to the diameter of the integral mounting
shank 162 and open at the front face of the body. Slidably mounted
in this central recess is a bushing 164 and inside this bushing is
a collet closing sleeve 165 with a pivotally mounted leaver 166 and
within the collet closing sleeve or ring 165 is a collet 167, this
collet 167 has a reduced threaded inner end 168 providing a
shoulder 169 thereon. A sleeve 171 is threadedly connected to the
reduced ends 168 of the collet 167 and extends through the mounting
shank 162. A bushing 172 surrounds this sleeve 171 that extends
through the shank to allow the collet to be rotatable therein. A
washer 173 and lock nuts 174 and 175 are threaded on the outer end
of the sleeve 171 for adjustable securing the collet in the bushing
162 and the body 161. A split ring 176 surrounds the bushing 164
and engages with a closing sleeve 177 that can work the lever 166
to act upon the collet closing sleeve 165.
In use the tool attachment will be advanced over a workpiece. The
means for clamping the collet 167 on the workpiece and for rotating
the collet and workpiece comprises a push bar or slide 178 adapted
to be actuated by the portion 58 of the cross slide 59 in the same
manner that the slide 43 of the attachment 40 is worked as shown in
FIG. 8. This push bar 178 has a cam groove 179 that receives a
roller 181 on the lower end of a tapered lever 182 that engages
with the split ring 176 to work the collet lever 166 and the
closing ring 165 by pivotal movement about its dropped fulcrum edge
183.
The push bar 178 has rack teeth that engage with a pinion 184 that
will rotate a shaft 185 and a large gear 186, FIG. 11, forward
movement of the bushing effected by the tilting of the lever 182
effects a closing of the collet ring 165 forwardly against and
upwardly and outwardly tapered end 187 of the collet 167 thus
closing the collet on the workpiece. Continued inward movement of
the push bar 178 will revolve the collet through a series of gears
mounted in the block body 181 and including pinions, all of which
are geared together following sequence with the gear 186 by pinion
gear 188, large gear 189, large gear 191 on shaft 192, pinion gear
193 with large gear 194 on shaft 195 and the large gear 194 engaged
with a collet gear 196 surrounding the collet sleeve extension 171
and held in place by a washer 197.
It will thus be apparent that there has been provided by the
attachment shown means for effecting the closing of the collet and
by continual movement of the pusher bar effect the rotation of the
collet to effect a working operation of the attachment for removing
the burr from the end thereof by a cutting tool element 143 on the
cross slide 59. With the attachment of FIG. 11 being used in place
of the attachment 40 as shown in FIG. 8, it can be seen that the
cutting tool 141 can be made available to effect a deburring of a
workpiece retained and supported in the collet 167. Gears are made
use of in this attachment to effect the rotation of the collet and
the workpiece in the same manner that the gears are used to effect
the rotation of a drill tool element as described in connection
with the first form of the invention, and as will be more apparent
with the description of further forms of the invention to be made.
As seen in FIG. 13, the pusher bar 178 has a laterally extending
member 198 that engages a large return spring 199 lying in an
opening 201 which has on the opposite side of the member 198 a
buffer return spring 202 in the same opening 201 and held in
engagement against outward displacement by a pin 203. The spring
199 is held against outward displacement by an upwardly extending
projection 204 at the opposite end of the opening 201. The slide
bar 178, as shown in FIG. 13 has adjoined to it by pins 205 and 206
a member 207 of the same length and containing the slots 179.
Referring now to FIGS. 14 to 17, there is shown a rotating tool
assembly, including a gear train for fast rotation of the drill
element resulting from impact bumping of a cross rack slide from
either one side or the other and in which a drill spindle can be
replaced within the tool casing by a tap tool spindle. In this form
of the invention 220 represents generally the attachment and this
attachment comprises a rectangular shaped hollow casing 222 having
a front wall 223, a rear wall 224, side walls 226 and 227, a bottom
wall 228 and a top wall 229. The front wall 223 has an enlargement
231 at the lower part thereof. A mounting stud or shank 232 extends
rearwardly from the rear wall 224 for engagement with the turret
head in the same manner as above described in connection with the
other forms of the invention and having a flat side for engagement
by the clamping parts to prevent rotation in the turret head. The
front wall 223 has a large central opening 233 through which a
drill chuck 234 extends this opening 233 is axially aligned with
the rearwardly extending stud 232 on the rear wall 224. This drill
chuck 234 is part of a spindle shaft 236 that has a pinion gear 237
and a spring clip retaining groove 238 on its rear end which in
cooperation with a washer 239 and a spring clip 241 holds a spindle
236 against outward axial displacement from a bearing bracket 242
secured by screws 243 to side wall 227 of the casing 222, the drill
chuck 234 is journaled in the opening 233 of the front wall 223 so
that the spindle 236 is held in axial alignment with the rearwardly
extending mounting stud 232 and for rotation. The drill chuck 234
retains a drill element 248 in a bushing 246 of C-section by a set
screw 247 that squeezes the bushing 246 about the drill shank,
FIGS. 17 and 19.
In FIG. 18, there is shown a spindle 236' that can be assembled in
the casing 222 and adapted for use with a drill tap 248. This
spindle 236' is longer than the spindle 236 and has a reduced rear
end portion 249 on which is mounted a tension spring 251 that is
adjustably retained upon the reduced diameter portion 249 by an
adjustable nut 252 to which it is secured. The opposite ends of the
spring 251 will be secured to the washer 239 and the tendency of
the spring is to hold the shaft 236' in the dotted line position as
shown in FIG. 18 and operable to feed the tap drill as the
attachment is being used to effect a tapping operation.
Slidable transversely through the forwardly extending portion 231
of the casing 222 is a transversely adjustable slide or rack bar
251 adapted to be bumped from either side of the casing as shown in
FIG. 16 by a cross slide portion 252 or 253. The rack bar 251 is
meshed with a pinion gear 254 carried on a small shaft 256
journaled in the forward end of the casing portion 231 and its
other end may be journaled in a boss portion provided in the
casing. This shaft 256 carries a large gear 257 that will be
rotated by the shaft 256 and which lies astraddle under pinion
gears 258 and 259 on respective large gears 261 and 262 which in
turn respectively engage with large gears 263 and 264. These large
gears 263 and 264 respectively engage with pinions 265 and 266 of
larger gears 267 and 268 that lie astraddle over a pinion 269 of a
centrally disposed large gear 271 which in turn will drive pinion
237 and spindle shaft 236 or 236'. In this manner a small movement
of the rack bar 251 will effect a greatly stepped up rotation of
the spindle shafts 236 or 236' so as to effect a complete drilling
or tapping operation that is needed on a workpiece. Since no spring
return is provided upon the rack mesher 51 the rack bar will be
bumped from the opposite sides and can be used to effect reverse
drilling of the tap drill 248 when tapping a drilled opening.
In FIGS. 20 and 21, 280 represents generally a tool assembly for
slotting and milling a workpiece with a rotary saw cut tool element
281. This attachment 280 comprises a rectangular shaped solid block
body 282 having a compartment 283 open at the front of the
attachment and having a round longitudinal extending passage 284 in
which a slide rack bar 285 is worked against the action of a
compression spring 286 anchored in the opening 284 by a cross pin
287 and this spring 286 urges the rod 285 forwardly. The rod 285
has a stud bolt 288 adjustable from the forward end of the rack bar
285 and held in place in its adjusted position by a lock nut 289.
The rack bar 285 has rack teeth 291 that engage and drive a pinion
gear 292 on a transversely extending shaft 293 extending across the
compartment 283 and journaled respectively at its ends 294 and 295
in the opposite sides of the block body 282. Fixed to the shaft 293
adjacent its end 295 is a large gear 296 that when turned will
drive a small pinion 297 on a shaft 298 that extends parallel to
the shaft 293 and is journaled at its ends 299 and 301 in the
opposite sides of the body 282 and carries its saw cut disc 281.
This shaft 298 has an intermediate threaded portion 302 on which
the disc 281 can be adjusted axially thereon and laterally of the
attachment and held in its adjusted position by lock nuts 303 and
304. It will thus be apparent that by bumping the threaded stud 288
of the push rack bar 285 that an accelerated turning of the cutting
disc 281 will be effected to cause a work piece to be milled and
slotted by the attachment. The attachment can be mounted on the
turret head by rearwardly extending mounting shank 306 as above
described and the rack bar 285 worked by a movable portion of the
machine lathe operable in a longitudinal direction therealong.
Referring now to FIGS. 22 to 24, there is shown a still further
form of the invention in a turret two spindle cross drilling
attachment indicated generally at 310. This attachment 310
comprises a substantially solid body 311 with an enlargement 312 at
the rear thereof from which rearwardly extends a mounting shank
313. This mounting shank 313 has a central bore 314 that extends
rearwardly therethrough and through the rear extension 312 for
communication with an open front space 315. A shaft 317 is
journaled at top and bottom forwardly extending portions 318 and
319 and fixed to the upper end of the shaft flush against the upper
portion 318 is a large gear 321 and fixed to the shaft 317 and
flush upon the bottom body portion 319 is a similar large gear 322.
A bevel pinion 323 is fixed to the upper end of the shaft 317
adjacent to gear 321 and meshes with a beveled gear 324 fixed on a
stud shaft 325 and journaled in the rear wall extension 312. A
pinion 326 is fixed on the shaft 325 and lies within the extension
312. A shaft 327 is journaled in the shank bore 314 and fixed on
the forward end of this shaft 327 and in the rear extension 312 is
a ratchet gear 328 having ratchet teeth 329 meshing with teeth on a
spring-pressed ratchet 331 on the inner end of the shaft 327 that
is forwardly spring-pressed by a compression spring 332 surrounding
a reduced diameter end 333 of the shaft 327 and held in place
against outer displacement from the bore 314 by a retaining ring
334 threaded into the end of the shank and the spring 332 reacting
between the retaining ring 334 and against a shoulder 335 on the
shaft 327 to hold the ratchet gear 328 against the ratchet teeth
329 of the gear 326. The gear 328 meshes with the pinion 326. A
pinion gear 336 is provided on the inner end of the shaft 327 and
meshes with a gear 337 fixed on a drive shaft 338 by a shear pin
339. On the other end of the shaft 338 is a pinion 340 which is
operated by a rack bar 341 adapted to be bumped in a manner above
described in connection with the other forms of the invention and
spring biased to a return position by a return spring 342 reacting
as shown in FIG. 22 between the side of the main body 311 and a
projection 343 on the rack bar 341. On the same shaft 338 with the
pinion 340 is a bevel gear 344 that meshes with a bevel gear 345
carried on a shaft 346 that extends parallel to the shaft 317 and
is journaled on the body 311. Blocks 347 and 348 and held in axial
displacement thereagainst by shaft bolts heads 349 and 351 threaded
into the opposite ends of the shaft 346. It will thus be seen that
upon the rack bar 341 being bumped to turn the gear 340 that the
double gear 344 thereof will turn through beveled gear 345 the
shaft 346.
Tap spindle 352 and drill spindle 353 are journaled respectively in
the upper forwardly extending portion 318 and lower extending
portion 319 for axial adjustment on their respective spline
extensions 354 and 355. Each spindle 352 and 353 has a casing, as
best seen in FIG. 24, at 357 that is rotatably mounted upon the
splined shaft in a ball bearing connection 358 therewith adjacent
an enlarged head or chuck 359. A ball bearing connection 361 is
provided upon the outer end of the casing with the chuck head 359.
A threaded tool chuck that is tapered and split as indicated at 362
is threaded into place in the head 359 and extends outwardly
thereof to retain a tap tool element 363. A splined gear 364 is
carried on the spline extension 354 or 355 and this gear meshes
with gear 321 on the shaft 317. At the bottom of the attachment the
drill assembly 353 has a gear 366 that meshes with the gear 322 at
the bottom of the body 311 and on the shaft 317. The drill tool
assembly 353 carries a spiral drill element 367. This drill element
367 is in axial alignment with the tap drill element 363 so that a
work piece 368 can be drilled and tapped by first one motion of the
drill 367 then the opposite motion of the tap 363 to provide a
tapped hole 369 in the workpiece 368.
A pair of complemental upper and lower gear segments 371 and 372
are pivotally connected respectively by pins 373 and 374 to the
front of the body 311. A tension spring 375 connects both ends of
the gear segments 371 and 372 together. These gear segments are
moved by pins 376 and 377 extending into cam lobe 378 and 379
turned by the shaft 346. As these gear segments 371 and 372 are
turned, the tap drill and drill assemblies 352 and 353 will be
moved toward each other, either together or in a manner provided by
the cam lobes 378 and 379 to work alternately upon the workpiece
368.
It can thus be apparent that by bumping the cross slide 341 through
the pinion gear 340, large shear gear 337, rear wall gear 328,
pinion gear 326, differential gears 324 and 323, large gears on the
ends of the shaft 317 at 321 and 322 that by engagement of these
respective gears with the respective gears 364 and 366 that the tap
drill and drill assemblies 352 and 353 will be rotated to effect
the work operation upon the workpiece 368. It should also be
apparent that by the same motion of the rack bar 341 that a working
of the shaft 346 is effected to cause through cam lobes 378 and 379
the drawing together of the tap assembly 352 and the drill assembly
353 by their respective segments 371 and 372 to effect the working
operations upon the workpiece 368. This is done at the same time
that the spindles are operated.
In FIGS. 25 to 27, 400 represents a cross tapping tool attachment
similar to the attachment just described, but differing in that
only one spindle assembly is used and no ratchet is provided for
disengaging an overloaded gear train. Also a shear pin is dispensed
with. This assembly 400 is for effecting a threading operation upon
a workpiece 401 and comprises a solid block body 402 having a rear
extension 403 from which a mounting shank 404 extends rearwardly
and adapted to be extended into a turret head in the manner above
described in connection with the previous forms of the invention.
In the bottom of the body 402 is a round opening 405 and which is
worked a compression spring 406 that extends outwardly and serves
as a return spring for a rack bar 407 adapted to be bumped by an
external part to supply power to the attachment. This spring 406 is
in abutment with the closed end 408 of the opening 405 and on its
free end externally of the body 402 it engages a depending end
portion 409 of the rack bar 407. The rack bar 407 has two sets of
rack teeth, one set at the side of the rack bar as indicated at 411
in FIG. 25 and the other set on top of the rack bar as indicated at
412 which will mesh with a pinion 413 of a shaft 414 with a gear
416 thereon, which drives a gear 417 serving as a pinion on a large
gear 418 in the rear extension 403 and which in turn meshes with a
pinion gear 419 fixed to a shaft 421 journaled in the rear
extension 403 and has a bevel gear 422 thereon which in turn drives
a bevel gear 423 on a shaft 424 journaled in the body 402 and which
in turn has a laterally extending gear 425 that meshes with a gear
426 fixed to a screw tap assembly 427 and adapted for vertical
adjustment by a spline connection 428 extending from the top of the
body 402. This thread tap spindle assembly 427 has a thread cutting
tool 429 adapted to be aligned with a cross cut hole 431 in
workpiece 401 to effect a threading operation therein as the thread
tap and spindle assembly 427 is feed axially into the
workpiece.
Journaled vertically in the body 402 is a vertically extending
shaft 432 that will be rotated by the rack teeth 411 on the side of
the rack bar 407 engaging with a pinion gear 433 so that the shaft
432 will be rotated to rotate a bevel gear 434 connected to the
upper end thereof that in turn drives a bevel gear 435 and a gear
segment 436 which has teeth 437 that work in a vertical gear rack
438 on the tap assembly 427 to cause at the same time with the
rotation of the tap assembly within its external sleeve a vertical
adjustment of the tap assembly to feed the tap thread element 429
into the opening 431 of the workpiece 401. It will be noted that
both the adjustment of the tap spindle and its rotation is
simultaneously effected to complete a threading operation in the
opening 431 of the workpiece 401. Reverse movement of the rack 407
under the action of the heavy turn spring 406 will cause reverse
rotation of the various gears and the working of the thread tap 429
out of the threaded opening 431 in the workpiece 401.
In FIG. 27 there is shown a two spindle cross drilling tool
attachment for a turret head as indicated generally at 450 that
comprises a solid block body 451 having a rearwardly extending
mounting shank 452 for the turret and a central opening 453 into
which a workpiece 454 is extended from a lathe chuck 455. A
vertically extending shaft 456 is journaled in the body 451 and
carries on its opposite end cam track members 457, 458 and work
gears 459 and 461. On this shaft 456 is a pinion 462 that will be
worked as above described by a rack bar 463 that will cause
rotation of the shaft 456.
In the work body are opposing openings 464 and 465 in which there
is vertically worked a drill assembly 466 and a tap drill assembly
467. These assemblies are constructed similar to the spindles
described in connection with either of the above attachments and
include respectively for the drill spindle 466 a gear 468 that
meshes with the top gear 459 and a spline projection 469, this
spindle 466 has a drill tool 471 to make hole 472 through workpiece
454. This spindle 466 is worked toward the workpiece 454 by a cam
lever 473 pivoted on the body 451 by a pin 474 and is worked by cam
457 by an extension 475 on the arm 473 engaging with the cam. The
arm 473 is secured by a pin to the drill spindle assembly 466. A
cam lever 477 is pivoted by a pin 478 for engagement by a
projection 479 upon the cam 458 to work the cam lever 477 and the
tap drill assembly 467 to cause engagement of the tap drill element
482 with the drilled opening 472 in the workpiece 454.
The drill and tap spindles 466 and 467 can be worked together or
alternately depending upon the arrangement of the feed cams 457 and
458 that operate the spindles vertically through the cam engaging
arms 473 and 477 respectively. It should be understood that the
drilling operation should be effected ahead of the tapping
operation and at least the drill element 471 partially withdrawn
from a completed hole 472 that has been made before effecting
engagement of the tapping tool element 482 with the open end of the
hole 472.
When the operations have been completed the work chuck 455 will be
withdrawn along with the workpiece 454 so that a new workpiece can
be replaced in the lathe chuck 455.
In FIGS. 28, 29 and 30 there is shown a still further form of a
cross drilling and tapping tool attachment indicated generally at
500 that has a cross slide assembly 501 with a projecting threaded
adjustable stud 502 adapted to be engaged by a bumper 503 to be
moved laterally inwardly against the action of a return spring 504.
This attachment 500 has a rectangular shaped body 505 with a
passage 506 therein containing the compression spring 504 and
serving as a guide for the rack bar 501. The return spring 504 is
disposed between a pin 507 on the rack bar 501 and a pin 508 on the
body 505. A gear 509 is fixed on a tubular shaft 511 that is
operatively connected with the rack bar 501 and movement of the
gear is imparted through the shaft 511 to a large bevel gear 512
that meshes with a bevel gear 513 on a tubular shaft 514 protruding
outwardly from the body 505 and held in position by a bolt and nut
assembly 515, this shaft 514 has a gear 516 that meshes with a
lower gear 517 held on a long shaft 518 to drive the shaft 518 that
is journaled in end block bearing 519 and 521. The gear 517 is held
on this shaft 518 by a nut assembly 522. This shaft 518 carries on
its opposite end a drill chuck 523 to which a drill tool element
524 is secured by a set screw 525.
Cylindrical bushing 526 is slidably supported on drill element 524
by means of an elongated angular bracket 527 slidable in a passage
528 in the bottom of the block body 505. This bracket 527 is
pressed outwardly by a coil spring 529 positioned behind the inner
end of the bracket 527 in the passage 528. An elongated closed slot
531 in the bracket 527 co-acts with a pin not shown to limit the
outward axial movement of the bracket 527, the end face of the
bracket at 526 is provided with a cradle face 532 to engage and
support a workpiece 533 while being worked upon by the drill 524,
the bushing member 526 guides the drill element 524 and insures
that it will be started on dead center. The attachment can be
fastened to the lathe by a bolt and nut assembly 535 in any
convenient manner.
In FIG. 31, there is shown a driving mechanism for driving a
spindle by the cam shown in FIG. 8. This cam is generally of star
shape as shown at 550 and is mounted on shaft 551 that contacts a
cam roller 552 on a cam lever 553 that may be moved in dotted line
position 554 by the cam 550 so as to drive a gear 555 that is in
mesh with a pinion 556 which in turn has a gear 557 that is in mesh
with a pinion 558 of a large gear 559 that drives a spindle 561.
When the cam roll 552 is lifted to its highest point on the cam
550, the entire cam lever assembly will swing back by spring
pressure to a lower point on the cam and the entire operation
continued again to alter the drive of the spindle shaft 561. This
gear train assembly is shown to show that a drive spindle of one
form or the other can be attached to a cam on a drive shaft and by
a gear train given the desired and complete work operation that is
effected with the other forms of the invention by the rack slide
bar.
It should now be apparent that there has been provided a turret
lathe rotating tool attachments which can be attached to the turret
of the lathe and which will provide its own power at increase
speeds to effect the drilling or tapping operation by simply
bumping a slide bar forming a part of the attachment. In all of
these forms of the invention a spindle is rotated and at the same
time adjusting movements for the various parts can be effected by
the same movement of the slide bar by branch connection either with
the slide bar or with the gear ring operated by the slide bar to
effect simultaneously the working of the drill or tapping spindle
while the drilling and tapping operation is being effected. By one
bumping stroke upon the attachment slide bar a complete work
operation is effected.
* * * * *